Specialty Products Company (SPC) 82390 Jeep JK Cams (2) This kit allows pinion angle adjustment of +/- 1.5 deg. on the front and rear of the popular Jeep JK Wrangler. Front caster can also be adjusted +/- 1.5 deg. to elongate the OEM bolt holes, use tool 74910 Cam Knockout Punch. Front caster will change as you adjust pinion angle. Use The offset ball joints 23510-23540 to gain additional caster and adjust camber.